Magnetic insert for sealing heads



23, l C. NASH 672,711

MAGNETIC INSERT FOR SEALING HEADS Filed Nov. 28, 3.951 2 Sheets-Sheet l INVENTOR J. 12V/45W ATTORNEY March 23, 1954 J. C. NASH 2,672,711

MAGNETIC INSERT FOR sEALING HEADS Filed Nov. 28, 1951 2 sheets-sheet 2 5. K E J i-155 11E 4% E Q .145 115 112 144 /105 1W @13g 71 1M l'/ /f E@ -J Xy I ""1 TTORNEY Patentedv Mar. 23, 1954 2,672,711 MAGNETIC INSERT FOR SEALING HEADS Joseph C. Nash, Fairmont,

W. Va., assigner to Westinghouse Electric Corporation, East Pittsburgh, Pa.,

a corporation of Pennsylvania Application November 28, 1951, Serial No. 258,720

3 Claims. l

This invention relates to sealing machines and, more particularly, to a magnetic insert for a sealing head of a butt-sealing machine.

In the butt-sealing of miniature incandescent lamps on automatic high speed machines, the

the lead Wires therebetween. During sealing the seal is formed to the desired constricted configuration for basing.

Due to the rotation of the sealing heads between stationary sealing res at the sealing stations, the gravitational force of the light lamp mount is insulcient to prevent shifting of the mount from its axial position within the bulb. As a result off-center mounts are often sealed into the bulb. In the case of glow lamps, it is necessary to recenter the lamp mount after sealing by sharp blows are shocks from instruments such as a hammer. A glow lamp is an electrical discharge device which produces light when an inert gas, usually neon, is ionized by the application of a voltage between two electroneemissive coated electrodes and passes current. alignment method is in shrinkage, such as bearing a miniature lamp mount centered in the bulb in the rotating sealing` stations of a butt-sealing machine.

A specific object is the elimination of sealed lamps having off-center mounts.

Another object is the elimination of the shock method for realigning oli-center mounts in sealed miniature lamps.

Other objects of the invention will appear to those skilled in the art to which it appertains as the description thereof proceeds, both by direct recitation thereof and by implication from the context.

Referring to the accompanying drawings, in which like numerals of reference indicate similar parts throughout the several views:

Fig. 1 is a side elevational vew of a sealing head of a miniature lamp butt-sealing machine wherein my invention is embodied;

Fig. 2 is an axial sectional View of a head, on the line II-II `of Fig. 1, in the direction of the arrows;

Fig. 3 is aV plan ,view of, the sealing head o1' Fig. 1, showing the tubulation holder assembly;

Fig. 4 is a side elevational view of a miniature lamp such as' a glow lamp;

Fig. 5 is an exploded elevational view of a bulb, a mount `and an exhaust tubulation for the glow lamp of Fig. 4;

Fig. 6 is an elevational view, with parts in axial section, of a portion of the sealing head of Fig. 1 during sealing; Y

Fig. 7 is a view similar to Fig. 6, showing the formation of the tubulation constriction at the end of the sealing operation.

Sealing head Referring to the drawings in detail, and particularly to Figs. 1, 2 and 3, a sealing head for a miniature lamp butt-sealing machine is designated by the reference numeral I0. This head, as shown in Figs. 1 and 2, has a hollow spindle l2 which is rotatable within a bushing I4 in a table I6 of the machine Il). VOn the lower end of the spindle a suitable rotating means, such as a gear wheel i8, is secured as by a set screw. Near the upper end of said spindle the hub 20 of a bottom yoke 22 is secured thereto as by a set screw not shown.

Between the hub 20 and the table I6 a thrust 24 is provided on spindle I2. On the upper end of vspin dle I2 and overlying yoke 22, a holding collar 25 is ailixed, as by a screw shown nFigufZ.

Slidablel vertically within a bushing 26 (Fig.

1) inthe upper portion of spindle I2 is a sealing head shaft 28, the upper end of which projects beyond the collar and the lower end of which projects below spindle I2 in table IB. On the lower end of shaft 28, adjustable cam track en gagement means, such as a bolt 30, shown in Fig. 1, screwed"`ntoc the threadedy end1rof`=the shaft 20Lfand xhaving asset-nut `32, .is provided for engagement with a cam track 31| of the sealing machine I0. The shaft 28 has a reducedi section on its upper end over which fits an Lshaped connector link 30' for transrnittin`` vertical motion, as hereinatter-.desor-ibedw The@ link 30 is affixed to shaft v2mal; :byza set-iscrew. through its hub portion, showncirr-FigeZL-r The yoke '22 has socketedend .portions 30 andv 40 (Fig. l) for mounting sealing"headguide'rods^ 42 and 44, respectively, by securing thereinathef reduced lower portions of said rods, as by set screws; shown inFig.- 1... On.the.11pper .reduced portions .-of,.rods`-.II2 andi 4K," a. horizontalfrward portion 4610i an upper yoke `or brace 4810i igenerallyT.-shaped .configuration inplan is` aiiedas by set screws.

This .br-ace 48 has .a=.horiz`ontal 'rearward 'portion` 5 0 extending .perpendicular.to'portin d'and provided with an upper offsletnge-.or hub'.52 on -its..rear=ward..end... A-cup.like.bulb` rest-5`4 suitably ,ofV nonemagn'etik-4 materialflsuchl as. brass, hase. magnetic 5B, .constiruotedjri accord ance t with .my inventiony secured therein .as y. by. a set screw, shown'in Fig'. 2; anda rod-like lower portion 58.A The .`latter..portion.. is. 4securedjina suitable .holdr'i the .hbriaontallportion' .4S o fthe. brace 48"atlany.dsired. elevationsasby a,.set. screw. Near .hub.52l' asuitable .hol isgprovided in l.rearwardhportion- .50 orlb'race 4 4'8 for .securing therein a tubulati'on..holderagaribox...tube .00,` as shown-.in rFig. .2.m asimilar. liolsprovideddn hub 52 .fioriv like .attaolmentetherein of 1a: bulb holder gear box tube|i2 R'otatabl withirltbe 62 and-projecting;frommbotlnends is a' bulb'- holder-.shaft-64.. A.bulbl..l1`older=M assembly B'Bis mounted-on mha-upper..endoaftube .|S2Zand .has a spur gear n Fig., 2.. .Il-.vertical slot]ilfisprovidedfinatle upper end ofv fshait .6M-C ANtubiilatinaholder.- assembly 12, similar to bulbholderyassembly;has;a.spur gear.-.1- carryingfa pn:slidableiri slot L10I. Hence the assemblyd 2 is-,..thereby,..sli`dable.verticallyon D shaft 64.

Onfthelower end .of .tubef02.aspring retainer mounting.=plate..-16 is.secured, asebysa .set screw shown in Fig. 2. Belowand-abutting plate L10-Ion tube 62, and attached to shaft'tlas by a set screw is a movablei-handle--1 IMFig. 1) for simultaneously opening and closing thebulb holder assemblyf 6i 'i and? the "tib'ltib holdr assembly T2 '.1 Af'adj acetitttnfiy hafldiis secliedi 68 pinnedLtoL-shaft fmassslownsin lx 1088; as by a set screw shown in Fig.

sembly 66 and downwardly from portion 50 through a hole in the spring retainer mounting plate 16. As shown in Fig. 2, both assembly 0S and plate 16 are secured to tube 60 as by set screws. Slidable within tube is a tubulation holder shaft 08 the upper end of which is secured as yby auset screw to the tubulat-ionf. holder assem'blyjf121 The upperiendiofatube 60 supports said assembly. Aixed to the lower end of shaft 2, is a spool connecting link 35 and said assembly 12. Be-

spring 60 and engaged by fork 92 of therebyvertiballyrmoving tween spoolv 00.and.plate 16 a compression 93-.istprovidediorurthe lower end of tube 15fshaftf:torreturanthe shaft 88 to normally lower position withinthe tube 60.

Tabulationl holder assembly As shown in Figs. 1 rand 3, this tubulation holder assembly 12 comprises a gear box V91|,v a gear box-"cover a"rearrackt 98 Aslidable inf the box"`94iandrengageable with spur' geardjand a front rack"|00also-"sliiable=inf-saidfbox'and engageable with said gear Tbulation 1 holder arms |02 and |044' extend from racksd 08^` and- I 00, respectWely;v for securing'ra" tubulatilon I 05 therebetween. As 'showrrirrFigg 1,* pins L| 'iand I sproject vertically `from'fthe'forwardiportions of'arms" 02A and i |04,l .r.es'pectively;` and* support spring" I 0"" whichi produces thee desiredtension on saidl tubulationrl 05.

Bulb-.holder "assembly Mgnetiqjsert Theimagneticsinsertz or'ztheebulbvrestlris suririblwforrnediofda:permanentiteniagnetfalloymai terial havingo thee followings: approxiinatef1com'.-

Operationr Wlmzri'iztfreeirfanditheLoper:

||4 of assembly 66, inserts a mount |26 into the V,open end of bulb |38 and then positions a tubulation |05 on said bulb between the open jaws |02 4and |04 of assembly T2. The insert 56 exerts a magnetic force on the nickel electrodes |152 and |44 of the mount |25, thereby centering said mount within said bulb |38.

As the sealing head I rotates between sealing res |48 and |50, as shown in Fig, 6, the tubulation and the open neck of the bulb |38 are sealed together with the lead wires |22 and |24 of the mount |25 therebetween. In the last sealing station of the machine l0, the sealing head shaft 20 is raised upwardly by the cam track 34. The connector link 36 raised the shaft 88 within the tube 60 and hence the tubulation holder assembly 'I2 upwardly, thereby forming a constriction in the plastic lower end of the tubulation |05, as shown in Fig. 7.

It will be understood that during the rotation of the sealing head I0 through the various stations of the sealing machine, the insert 55 of `my invention has securely held by the force of magnetism the electrodes |42 and |44, and hence the mount |26 of the lamp |28, in the `desired axial alignment with the bulb |38 and tubulation |05. At the unloading station of the sealing machine the operator opens the jaws of the bulb holder assembly 66 and the tubulation holder assembly 'I2 by means of movable handle 73 and removes the tubulated lamp from the machine.

After a suitable automatic exhaust, which may comprise a bake, cathode sintering, electrode out gassing and a suitable final dll, the lamp is tipped off in the constricted area of the tubulation |515 and a base |40 affixed thereto with a suitable cement.

Thus it will be seen from the foregoing description that the magnetic insert 5t for a bulb rest of a miniature lamp butt-sealing machine head has eliminated the disadvantages and defects of the prior art heads. My magnetic insert holds the miniature lamp mount, such as mount |26, centered in a bulb, such as bulb |38, in the rotating sealing stations of a buttsealing machine. As a result sealed lamps having off-center mounts have been eliminated. No longer is it necessary to realign off-center mounts in sealed miniature lamps, such as glow lamp |28, by the shock method.

Although a preferred embodiment of my invention has been disclosed, it will be understood that modifications may be made within the spirit and scope of the appended claims.

I claim:

1. A sealing head for a miniature lamp butt sealing machine having a hollow spindle and a sealing head shaft therein, means for rotating said spindle and said sealing head shaft, means for vertically reciprocating said sealing head shaft within said spindle, a bottom yoke on said sealing head shaft, sealing head guide rods extending upwardly from end portions of said bottom yoke, an upper yoke on the upper portion of said rods and having a rearwardly projecting portion, a tubulation holder shaft tube and a bulb holder shaft tube carried on said rearwardly projecting portion of said yoke, a link secured to the bottom portion of said sealing head shaft, a tubulation holder shaft adjacent said sealing head shaft and reciprocably contained within said tubulation holder shaft tube, a spool carried by the lower end portion of said tubulation holder shaft for engagement with said link, a tubulation holder assembly secured to the upper portion of said tubulation holder shaft, a bulb holder shaft adjacent said tubulation holder shaft and rotatably contained within said bulb holder shaft tube, a bulb holder assembly secured to said bulb holder shaft, said bulb holder assembly having a bulb holder spur gear on said bulb holder shaft, a pair of bulb holder racks for engagement with said bulb holder spur gear, and a bulb holder arm secured to each of said bulb holder racks, means for limitedly rotating said bulb holder shaft, an adjustable cup-like bulb rest secured on said upper yoke directly beneath said bulb holder arms when in the closed position, and a magnetic insert within said rest.

2. A sealing head for a miniature lamp butt sealing machine having a hollow spindle and a sealing head shaft therein, means for rotating said spindle` and said sealing head shaft, means for vertically reciprocating said sealing head shaft within said spindle, a bottom yoke on said sealing head shaft, sealing head guide rods extending upwardly from end portions of said bottom yoke, an upper yoke on the upper portion of said rods and having a rearwardly projecting portion, a tubulation holder shaft tube and a bulb holder shaft tube carried on said rearwardly projecting portion of said yoke, said bulb holder shaft tube being provided with a bulb holder shaft tube slot in its upper end, a link secured to the bottom portion of said sealing head shaft, a tubulation holder shaft adjacent said sealing head shaft and reciprocably contained within said tubulation holder shaft tube, a spool carried by the lower end portion of said tubulation holder shaft for engagement with said link, a tubulation holder assembly secured to the upper portion of said tubulation holder shaft, said tubulation holder assembly including a tubulation holder spur gear on said bulb holder shaft and provided with a tubulation holder gear pin for engagement with said bulb holder shaft tube slot to permit vertical reciprocation of said tubulation holder assembly with said tubulation holder shaft and to permit rotation of said tubulation holder spur gear with said bulb holder shaft, a pair of tube holder racks for engagement with said tubulation holder spur gear, and a tubulation holder arm secured to each of said tubulation holder racks, a bulb holder shaft adjacent said tubulation holder shaft and rotatably contained within said bulb holder shaft tube, a bulb holder assembly secured to said bulb holder shaft, said bulb holder assembly having' a bulb holder spur gear on said bulb holder shaft, a

, pair of bulb holder racks for engagement with said bulb holder spur gear, and a bulbi holder arm secured to each of said bulb holder racks, means for limitedly rotating said bulb holder shaft, an adjustable cup-like bulb rest secured on said upper yoke directly beneath said bulb holder arms when in the closed position, and a magnetic insert within said rest.

3. A sealing head for a miniature lamp butt sealing machine having a hollow spindle and a sealing head shaft therein, means for rotating said spindle and said sealing head shaft, means for vertically reciprocating said sealing head shaft within said spindle, a bottom yoke on said sealing head shaft, sealing head guide rods eX- tending upwardly from end portions of said bottom yoke, an upper yoke on the upper portion of said rods and having a rearwardly projecting portion, a tubulation holder shaft tube and a bulb holder shaft tube carried on said rearwardly projecting portion of `said yoke, said bulb ythe lower end portion of said tubulation holder shaftfor engagement with said link, a tubulation holder assembly secured to the upper portion .of said tubulation holder shaft, said tubulation holder assembly including a tubulation holder spur gear on said bulb holder shaft and provided witha tubulatio'nv holder gear `pin for engagement ywith said bulbvholder shaft tube slot V.to'rpe'rmit vertical.reciprocationof said tubulation' holder assembly with said tubulation holder :shaft .andto permit rotation of said tubulation holderv spury gear with said bulb holder shaft, a hair-:of tube .holder racks for engagement with saidtubula'tion holder spur gear, and a tubulae-tion holder ar/m secured 4to each of said tubula- -tion .holder racks, ,compression means on said -i,ubulation` holder shaft for returning said tubulation holder assembly to `the normally lower ,positionVa bulb holder shaft adjacent said tubulation holder shaft 'and rotatably v''c'onftain'e'd within said bulb holder shaft tube, a bulbho'lder assembly .secured to said bulb 'holder shaft, said bulb holder assembly having av bulb holder spur gear` on said bulb holder shaft, a pair of bulb holder racks for engagement with said bulb holder spur gear, and a bulb holder arm Secured to each of said bulb holder racks, means for 'limitedly rotating said bulb holder shaft vand open ing said arms, torsionmeans jon said bulb holder shaft lfor ,returning said arms to a normally closed `position an adjustable cup-like bulb rest securedy on lsaid upper yoke directly beneath said bulb holder arms when in the closed position,

and a permanent magnetic insert Within said rest. JOSEPH C. NASHY References Cited in the le of 'this patent UNITED STATES PATENTS Number Name Date 1,716,167 Grogan June 4, 19,29 1,742,153 stues et a1. Dec. 351, 1-929 2,021,001 Donovan etal Nov. 1-2, 1935 2,549,359 Bakanau Apr. 17, 1951 

